JP5206657B2 - Batteries with stacked pole groups - Google Patents
Batteries with stacked pole groups Download PDFInfo
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- JP5206657B2 JP5206657B2 JP2009278200A JP2009278200A JP5206657B2 JP 5206657 B2 JP5206657 B2 JP 5206657B2 JP 2009278200 A JP2009278200 A JP 2009278200A JP 2009278200 A JP2009278200 A JP 2009278200A JP 5206657 B2 JP5206657 B2 JP 5206657B2
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- negative electrode
- positive electrode
- current collector
- active material
- electrode plate
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- 229910052751 metal Inorganic materials 0.000 claims description 22
- 239000002184 metal Substances 0.000 claims description 22
- 239000007773 negative electrode material Substances 0.000 claims description 12
- 238000004080 punching Methods 0.000 claims description 10
- 239000007774 positive electrode material Substances 0.000 claims description 8
- 239000006182 cathode active material Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 description 8
- 239000005518 polymer electrolyte Substances 0.000 description 8
- 239000000805 composite resin Substances 0.000 description 7
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 239000002243 precursor Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 239000003792 electrolyte Substances 0.000 description 3
- 239000008151 electrolyte solution Substances 0.000 description 3
- 238000010894 electron beam technology Methods 0.000 description 3
- 239000011255 nonaqueous electrolyte Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 2
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 238000005470 impregnation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 1
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 1
- 229910013063 LiBF 4 Inorganic materials 0.000 description 1
- 229910012851 LiCoO 2 Inorganic materials 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000006230 acetylene black Substances 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-M acrylate group Chemical group C(C=C)(=O)[O-] NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000011245 gel electrolyte Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 239000005001 laminate film Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920001451 polypropylene glycol Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- HNJBEVLQSNELDL-UHFFFAOYSA-N pyrrolidin-2-one Chemical compound O=C1CCCN1 HNJBEVLQSNELDL-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Connection Of Batteries Or Terminals (AREA)
Description
本発明は、積層式極群を備えた電池に関する。 The present invention relates to batteries having a laminated type-polar.
携帯用端末機器の普及により、軽量でエネルギー密度の高いリチウムイオン電池が重用されている。携帯用端末機器の多種多様な形状に対応して、電池にもそれに対応した多種多様な形状が求められるようになった。電池の生産ラインにおける寸法や形状の変更、即ち、型変えは、低コストかつ短時間で行うことが要求されるが、従来の円筒型電池や角型電池では、電槽用の金型変更が必要である。この金型変更には、金型の製造期間がかかり、製造コストもかさむので、前記要求を満たすことができなかった。 With the widespread use of portable terminal devices, lightweight lithium ion batteries with high energy density have been heavily used. Corresponding to various shapes of portable terminal devices, a variety of shapes corresponding to the batteries have been required. Changing the dimensions and shape of the battery production line, that is, changing the mold, is required to be performed at a low cost and in a short time. However, in conventional cylindrical batteries and prismatic batteries, there is a need to change the mold for the battery case. is necessary. This mold change requires a mold manufacturing period and increases the manufacturing cost, and thus the above-mentioned requirement cannot be satisfied.
近年、金属電槽を用いない電池として、例えばアルミラミネートフィルムと称される金属樹脂複合体フィルムで封口した扁平型電池が注目されている。この扁平型電池では、金属電槽を用いていないため寸法や形状変更があっても電槽用の金型変更は必要ではないが、電極端子位置の変更に対応するためには、正極板や負極板に設ける集電タブの位置を変更する必要があるため、その都度極板打抜き金型の変更が必要であり、このための設計および製造に時間と経費が嵩んでいた。
また、例えば電極対を並列接続して積層極群を形成する際、例えば片面塗工された正極板および片面塗工された負極板から構成される電極対の場合には正極板および負極板の塗工されていない集電体金属面があるために、同方向で積層されると正極板および負極板の露出金属面同士が接触するので正極と負極が短絡した状態となる。これを防止するために、前記電極対は、交互に向きをかえて同極同士、すなわち正極と正極または負極と負極の露出金属面が重なり合うように積層する場合を考える。このとき、集電タブの位置が左右で非対称であると、積層された極群に形成される複数個の同極の集電タブ位置が一致せず互い違いとなるので、端子とうまく接合できないことが問題であった。
In recent years, as a battery that does not use a metal battery case, for example, a flat battery sealed with a metal resin composite film called an aluminum laminate film has attracted attention. Since this flat battery does not use a metal battery case, it is not necessary to change the mold for the battery case even if there is a change in size or shape, but in order to cope with the change of the electrode terminal position, Since it is necessary to change the position of the current collecting tab provided in the negative electrode plate, it is necessary to change the electrode plate punching die each time, and the design and manufacturing for this time and cost have increased.
In forming the field electric pole pairs connected in parallel to the laminated pole group for example, for example, single-sided coated by positive electrode plate and positive electrode plate from the negative electrode plate that is applied onto one side of the case of the electrode pair formed and a negative electrode Since there is a current collector metal surface that is not coated with the plate, when the layers are laminated in the same direction, the exposed metal surfaces of the positive electrode plate and the negative electrode plate come into contact with each other, so that the positive electrode and the negative electrode are short-circuited. To prevent this, the electrode pairs, the poles changing the orientation alternately, namely consider the case of laminating such exposed metal surface of the positive electrode and the positive electrode or the negative electrode and the negative electrode overlap. At this time, if the positions of the current collecting tabs are asymmetric on the left and right sides, the current collecting tab positions of the same polarity formed in the stacked pole group do not match, and the current collecting tabs are staggered. Was a problem.
本発明は、前記従来技術の問題点に鑑みなされたものであり、極板打抜き金型をいくつも用意することなく、形状変更に敏速且つ低経費で対応できる電池を提供するものである。 The present invention has been made in view of the above-mentioned problems of the prior art, and provides a battery that can respond quickly to a shape change and at low cost without preparing any number of electrode plate punching dies.
上記課題を解決するため、本発明は、正極活物質が配された正極集電体からなる正極板と、負極活物質が配された負極集電体からなる負極板と、が積層された積層式極群を備える電池において、前記積層式極群は、正極活物質が片面に配された正極集電体からなる正極板及び／又は負極活物質が片面に配された負極集電体からなる負極板を備え、前記正極活物質が片面に配された正極集電体の露出金属面同士又は前記負極活物質が片面に配された負極集電体の露出金属面同士が向きを変えて積層されており、前記正極集電体又は前記負極集電体は、一枚の材料から打ち抜かれてなり、正極活物質又は負極活物質が配置される部分から突出した集電タブ部分を有し、且つ、電極面に垂直な対称面を有し表裏形状が同じであることを特徴とする積層式極群を備える電池である。また、前記積層式極群が、隣り合う前記正極活物質が片面に配された正極集電体の露出金属面同士又は前記負極活物質が片面に配された負極集電体の露出金属面同士が向かい合うように積層された部分を含むことを特徴としている。 To solve the above problems, the present invention is laminated to a positive electrode plate on which a cathode active material composed of a positive electrode current collector which is arranged, a negative electrode plate comprising a negative electrode current collector a negative electrode active material was arranged, it is stacked in batteries of Ru with a Shikikyokugun, the stack type pole group, the negative electrode current collector a positive electrode plate and / or the negative electrode active material the positive electrode active material is composed of a positive electrode collector disposed on one side it was arranged on one side comprising a negative electrode plate comprising the exposed metal surfaces of the positive electrode exposed metal surface of the active material the positive electrode collector disposed on one side or between the negative electrode active material disposed on one surface a negative electrode current collector redirected It is stacked Te, the positive electrode current collector or the negative electrode current collector is made by punching from a sheet of material, have a collector tab portion projecting from a portion on which a cathode active material or negative electrode active material is placed and, and, the product of front and back shape has a vertical plane of symmetry in the electrode surface, characterized in that the same A cell comprising an expression-polar. In addition, the stacked electrode group is formed by exposing the adjacent positive electrode active materials disposed on one side to each other, or exposing exposed metal surfaces of the negative electrode current collector including the negative electrode active material disposed on one side. It is characterized by including the part laminated | stacked so that may face each other.
即ち、集電タブをその極板内に電極面に垂直な対象面を持つように配置することにより、片面塗工された同極の極板の露出金属面同士が異なる向きとなるように配置しても、その集電タブは他の同極の集電タブに重なるので、端子と容易に接合できる様に改善したものである。 In other words, by arranging the current collector tab in the electrode plate so as to have a target surface perpendicular to the electrode surface, the exposed metal surfaces of the same electrode plate coated on one side are arranged in different directions. Even so, the current collecting tab overlaps with other current collecting tabs of the same polarity, which is improved so that it can be easily joined to the terminal.
ここで、電極の外周に形成させる集電タブは、幅が広い方が、積層式極群に端子を溶接する部位の自由度が高まる。 Here, as for the current collection tab formed in the outer periphery of an electrode, the one where a width | variety is wide increases the freedom degree of the site | part which welds a terminal to a lamination type pole group.
端子の接着位置の自由度を持たせるため、集電タブの幅は、少なくとも端子の幅よりも大きいことが求められる。また、少なくとも端子を配置する範囲は、広ければ広いほど端子溶接位置の自由度が上がるので好ましいが、広すぎると、対向する電極の集電タブに重なり、短絡するため、対向する電極の集電タブに重ならない範囲内にする必要がある。 The width of the current collecting tab is required to be at least larger than the width of the terminal in order to provide flexibility in the bonding position of the terminal. In addition, it is preferable that at least the range in which the terminals are arranged is wider, since the degree of freedom of the terminal welding position increases. However, if the range is too large, the current collecting tabs of the opposing electrodes overlap with the current collecting tabs of the opposing electrodes. It must be within the range that does not overlap the tab.
外装体に金属樹脂複合体フィルムを用いた非水電解質電池においては、金属樹脂複合体フィルムは、従来の金属缶の電槽に比較して、外的衝撃に弱く破損し易いため、電解質が液体であると破損部からの漏液が問題となる。また、液保持性の低い電極やセパレータを用いている場合においては、正極端子と負極端子を電池の同一辺から各一個所ずつ出す場合には、該辺を上方に向けておくことで、流れ出た電解液が封口部を汚染することを避けることができるが、正極端子と負極端子を電池の異なる辺から出す場合、正極端子と負極端子をそれぞれ複数個ずつ出す場合、あるいはこれらの端子の出し方を不特定に変更可能にする場合には、電解液が重力によって流動もしくは、しみ出してしてしまい、封口部を汚染するので、充分な封口が得られないという問題があった。このため、電解質は流動性のないポリマー電解質またはゲル電解質が好適である。 In a non-aqueous electrolyte battery using a metal resin composite film for the outer package, the metal resin composite film is weaker to external impact and more easily damaged than a conventional metal can battery, so the electrolyte is liquid. If this is the case, leakage from the damaged part becomes a problem. In addition, when using electrodes or separators with low liquid retention, when the positive electrode terminal and the negative electrode terminal are put out one by one from the same side of the battery, the flow can be It is possible to prevent the electrolyte from contaminating the sealing portion. However, when the positive and negative terminals are taken out from different sides of the battery, when plural positive and negative terminals are provided, or when these terminals are taken out, When the direction can be changed indefinitely, the electrolytic solution flows or oozes out due to gravity and contaminates the sealing portion, so that there is a problem that a sufficient sealing cannot be obtained. For this reason, the polymer electrolyte or gel electrolyte with no fluidity is suitable as the electrolyte.
本発明によれば、極板内に鏡像面を持たせることにより、片面塗工された極板を備えた積層式極群の作製時に極板の種類を二分の一にすることが可能となったので、製造工数と電極打抜き金型の数を削減することができる。したがって、その工業的価値は極めて大である。 According to the present invention, by providing a mirror image surface in the electrode plate , it becomes possible to halve the type of electrode plate when producing a laminated electrode group having an electrode plate coated on one side. Therefore, the number of manufacturing steps and the number of electrode punching dies can be reduced. Therefore, its industrial value is extremely large.
本発明の実施例を挙げ、本発明を具体的に説明する。ただし、本発明はそれらの実施例のみに限定されるものではない。 Examples of the present invention will be given to specifically explain the present invention. However, this invention is not limited only to those Examples.
（実施例）
エチレンカーボネートとγ−ブチロラクトンの２：３の質量比で混合した溶液に、ＬｉＢＦ4を１ｍｏｌ／ｌの濃度で溶解させた電解液に、ポリエチレンオキサイドとポリプロピレンオキサイドの共重合体でアクリル酸エステル基が３個付加されたマクロマーを２０質量％混合し、ポリマー電解質前駆体Ａを調整した。平均分子量が５００であるビスフェノールＡのエチレンオキサイド付加体をアクリレート化したモノマーを上記電解液に２０質量％混合し、ポリマー電解質前駆体Ｂを調整した。
(Example)
An electrolyte solution in which LiBF 4 is dissolved at a concentration of 1 mol / l in a solution in which ethylene carbonate and γ-butyrolactone are mixed at a mass ratio of 2: 3 is a copolymer of polyethylene oxide and polypropylene oxide and has an acrylate group. The polymer electrolyte precursor A was prepared by mixing 20% by mass of the three added macromers. A polymer electrolyte precursor B was prepared by mixing 20% by mass of a monomer obtained by acrylated an ethylene oxide adduct of bisphenol A having an average molecular weight of 500 with the above electrolytic solution.
セパレータは、厚み３０μｍのポリプロピレン不織布にポリマー電解質前駆体Ａを含浸させ、それに電子線を照射することにより得られた厚さ３５μｍのゲル状フィルムを用いた。 As the separator, a gel-like film having a thickness of 35 μm obtained by impregnating the polymer electrolyte precursor A into a polypropylene nonwoven fabric having a thickness of 30 μm and irradiating it with an electron beam was used.
正極板には、８７質量部の正極活物質であるＬｉＣｏＯ２と、８．５質量部の導電助剤である人造鱗片状黒鉛および１．５質量部のアセチレンブラックとを混合した混合粉体に、１２質量％ポリフッ化ビニリデンのＮ−メチル−２−ピロリドン溶液を２５質量部加えて練り、さらにＮ−メチル−２−ピロリドンを２９質量部加えてペースト状にしたものを正極集電体となる２０μｍアルミニウム箔上に約２６０μｍの厚さで塗布したものを乾燥後、金型で打ち抜き、約１００μｍにプレスしたものを用いた。金型で打ち抜かれた正極板の形状は、長辺が６１ｍｍで短辺が４２ｍｍである長方形の電極部に長さ５ｍｍで幅１８ｍｍの集電タブが前記電極外周部の一辺の中心に配置された図１に示すような極板形状とした。また、ここで作製した極板は図１の破線で示した電極面に垂直な対称面５を極板内に持つ。図１において、１は正極集電タブ、２は正極活物質層である。 On the positive electrode plate, mixed powder obtained by mixing LiCoO 2 as a positive electrode active material of 87 parts by mass, artificial scaly graphite as a conductive auxiliary agent of 8.5 parts by mass and acetylene black of 1.5 parts by mass is used. Then, 25 parts by mass of an N-methyl-2-pyrrolidone solution of 12% by mass polyvinylidene fluoride was added and kneaded, and 29 parts by mass of N-methyl-2-pyrrolidone was further added to form a paste to be a positive electrode current collector. What was coated on a 20 μm aluminum foil with a thickness of about 260 μm was dried, then punched with a mold and pressed to about 100 μm. The shape of the positive electrode punched out by a mold is such that a current collecting tab having a length of 18 mm and a width of 18 mm is arranged at the center of one side of the electrode outer peripheral portion on a rectangular electrode portion having a long side of 61 mm and a short side of 42 mm. The electrode plate shape shown in FIG. Further, the electrode plate produced here has a symmetry plane 5 perpendicular to the electrode surface indicated by the broken line in FIG. In Figure 1, 1 is a positive electrode current collector tab, 2 is a cathode active material layer.
負極板には、負極活物質の黒鉛系炭素として層間距離ｄ００２が３．３７Å、結晶子サイズＬｃが３６０Åである繊維状人造黒鉛９４質量部に１２質量％ポリフッ化ビニリデンのＮ−メチル−２−ピロリドン溶液を５０質量部加えて練り、さらにＮ−メチル−２−ピロリドンを２４質量部加えてペースト状にしたものを負極集電体となる１２μｍ電解銅箔上に約２１０μｍで塗布したものを乾燥後、金型で打ち抜き約１０５μｍにプレスしたものを用いた。金型で打ち抜かれた負極板の形状は、長辺が６２ｍｍで短辺が４３ｍｍである長方形の電極部に長さ５ｍｍで幅８ｍｍ集電タブが前記電極外周部の一辺の両端に配置された図２に示すような集電タブが２箇所に形成された極板形状とした。また、ここで作製した極板は図２の破線で示した電極面に垂直な対称面５を極板内に持つ。図２において、３は負極集電タブ、４は負極活物質層である。 The negative electrode plate is composed of 94 mass parts of fibrous artificial graphite having an interlayer distance d002 of 3.37 mm and a crystallite size Lc of 360 mm as graphite-based carbon of the negative electrode active material, and 12 mass% polyvinylidene fluoride N-methyl-2- 50 parts by weight of a pyrrolidone solution was added and kneaded, and further 24 parts by weight of N-methyl-2-pyrrolidone was added to form a paste, which was applied on a 12 μm electrolytic copper foil serving as a negative electrode current collector at about 210 μm and dried. Thereafter, a punched die was used to press to about 105 μm. The shape of the negative electrode plate punched out by a metal mold was a rectangular electrode part having a long side of 62 mm and a short side of 43 mm, and a current collecting tab having a length of 5 mm and a width of 8 mm arranged at both ends of one side of the electrode outer peripheral part. A current collecting tab as shown in FIG. The electrode plate produced here has a symmetry plane 5 perpendicular to the electrode surface indicated by the broken line in FIG. 2, 3 a negative electrode current collecting tab 4 is a negative electrode active material layer.
前記正極板および負極板に、ポリマー電解質前駆体Ｂを真空含浸により浸透させ、電子線照射を行い、電極内にポリマー電解質を形成した。これらの間に前記セパレータを挟んで重ね、一対の正・負極から構成される電極対を図３に示す。６はセパレ−タである。また、前記電極対を、正極板と正極板、又は、負極板と負極板の露出金属面同士が向かい合うように積層した積層式極群を図４に示す。前記積層式極群に対し、幅５ｍｍのアルミニウム製の端子を正極集電タブの端に溶着し、前記端子と同方向にある負極集電タブの端に幅５ｍｍのニッケル製の端子を溶着した。 The polymer electrolyte precursor B was infiltrated into the positive electrode plate and the negative electrode plate by vacuum impregnation, and was irradiated with an electron beam to form a polymer electrolyte in the electrode. FIG. 3 shows an electrode pair composed of a pair of positive and negative electrodes, with the separator interposed therebetween. Reference numeral 6 denotes a separator. FIG. 4 shows a stacked pole group in which the electrode pairs are stacked so that the exposed metal surfaces of the positive electrode plate and the positive electrode plate or the negative electrode plate and the negative electrode plate face each other . An aluminum terminal having a width of 5 mm was welded to the end of the positive electrode current collecting tab, and a nickel terminal having a width of 5 mm was welded to the end of the negative electrode current collecting tab in the same direction as the terminal. .
端子７を溶着した積層式極群を金属樹脂複合体フィルム８で封口した電池を図５に示す。この図では、正・負極端子は、電池の一辺から各一つずつ出ているよう配置されているが、必ずしも正極端子と負極端子が同一辺から出ている必要はなく、また、正極端子や負極端子の個数も一個である必要はなく、同一である必要もない。 The stack type-polar with welded terminals 7 and sealing the batteries in metal-resin composite film 8 shown in FIG. In this figure, the positive and negative terminals are arranged so as to protrude one by one from one side of the battery, but the positive electrode terminal and the negative electrode terminal do not necessarily have to protrude from the same side. The number of negative terminals need not be one, and need not be the same.
（比較例）
金型で打ち抜くまでの工程は実施例と同じ方法で作製した正極板に対し、長辺が６１ｍｍで短辺が４２ｍｍである長方形の電極部に長さ５ｍｍの集電タブが幅５ｍｍで、電極の塗工面を上にして前記電極外周部の一辺の左端から１２ｍｍのところに集電タブの左端が来るように前記電極外周部の一辺に配置された図６に示すような極板形状に金型で打ち抜き、約１００μｍにプレスし、正極板を作製した。また、前記正極板の鏡像体である前記集電タブが前記電極外周部の一辺の右端から１２ｍｍのところに集電タブの右端が来るように前記電極外周部の一辺に配置された図７に示すような極板も、同様にして金型で打ち抜き作製した。
(Comparative example)
Steps up to punching with a die whereas positive plate was made created in the same manner as in Example, long side short side with collector tab width 5mm length 5mm on a rectangular electrode portion is 42mm in 61 mm, In the electrode plate shape as shown in FIG. 6 arranged on one side of the electrode outer peripheral portion so that the left end of the current collecting tab comes to 12 mm from the left end of one side of the electrode outer peripheral portion with the coated surface of the electrode facing up. punching in a mold, and pressed to about 100μm, was made create the positive electrode plate. Further, said current collecting tab is a mirror image of the positive electrode plate is disposed on one side of the electrode peripheral portion as the right end of the current collector tabs come to 12mm from the right edge of one side of the electrode peripheral portion 7 The electrode plate shown in Fig. 5 was similarly punched out with a mold.
金型で打ち抜くまでの工程は実施例と同じ方法で作製した負極に対し、長辺が６２ｍｍで短辺が４３ｍｍである長方形の電極部に長さ５ｍｍで幅５ｍｍの集電タブが前記電極外周部の一辺の左端に配置された図８に示すような極板形状に金型で打ち抜き、約１００μｍにプレスし、負極板を作製した。また、前記負極板の鏡像体である前記集電タブが前記電極外周部の一辺の右端に配置された図９に示すような極板も、同様にして金型で打ち抜き作製した。 Steps up to punching with a mold whereas the negative electrode was manufactured created in the same manner as in Example, the long side a rectangular width 5mm length 5mm to the electrode portions collector tab is the electrode short side at 62mm is 43mm A negative electrode plate was produced by punching out into a plate shape as shown in FIG. 8 arranged at the left end of one side of the outer peripheral portion with a mold and pressing it to about 100 μm. Further, the electrode plate as shown in FIG. 9 in which the current collecting tab, which is a mirror image of the negative electrode plate, was arranged at the right end of one side of the electrode outer peripheral portion was similarly punched out with a mold.
前記正極板および負極板に、ポリマー電解質前駆体Ｂを真空含浸により浸透させ、電子線照射を行い、電極内にポリマー電解質を形成した。これらの間に前記セパレータを挟んで重ね、一対の正・負極から構成される電極対を図１０に示す。また、前記電極対を、正極板と正極板、又は、負極板と負極板の露出金属面同士が重なり合うように積層した積層式極群を図１１に示す。前記積層式極群に対し、幅５ｍｍのアルミニウム製の端子を正極集電タブの端に溶着し、前記端子と同方向にある負極集電タブの端に幅５ｍｍのニッケル製の端子を溶着した。 The polymer electrolyte precursor B was infiltrated into the positive electrode plate and the negative electrode plate by vacuum impregnation, and was irradiated with an electron beam to form a polymer electrolyte in the electrode. An electrode pair composed of a pair of positive and negative electrodes is shown in FIG. Further, FIG. 11 shows a stacked electrode group in which the electrode pairs are stacked so that the exposed metal surfaces of the positive electrode plate and the positive electrode plate or the negative electrode plate and the negative electrode plate overlap each other . An aluminum terminal having a width of 5 mm was welded to the end of the positive electrode current collecting tab, and a nickel terminal having a width of 5 mm was welded to the end of the negative electrode current collecting tab in the same direction as the terminal. .
端子を溶着した積層式極群を金属樹脂複合体フィルムで封口した積層式非水電解質電池の概略図は、図５に示す実施例と同様になる。 A schematic diagram of a laminated nonaqueous electrolyte battery in which a laminated electrode group with terminals welded is sealed with a metal resin composite film is the same as the embodiment shown in FIG.
以上の説明から明らかなように、本発明によれば、極板内に電極面に垂直な対称面を持たせることにより、片面塗工された極板を備えた積層式極群の作製時に極板の種類を二分の一にすることが可能となったので、製造工数と電極打抜き金型の数を削減することができる。したがって、その工業的価値は極めて大である。 As is clear from the above description, according to the present invention, the electrode plate is provided with a symmetrical plane perpendicular to the electrode surface, so that the electrode can be formed at the time of producing a laminated electrode group having a single-side coated electrode plate. Since the type of the plate can be halved, the number of manufacturing steps and the number of electrode punching dies can be reduced. Therefore, its industrial value is extremely large.
１ 正極集電タブ
２ 正極活物質層
３ 負極集電タブ
４ 負極活物質層
５ 電極面に垂直な対称面
８ 金属樹脂複合体フィルム
1 positive electrode current collector tab 2 positive electrode active material layer 3 anode current collector tab 4 negative active material layer 5 electrode surface perpendicular symmetry plane 8 metal-resin composite film
Claims (2)
In the stacked electrode group, the exposed metal surfaces of the positive electrode current collector in which the adjacent positive electrode active materials are arranged on one side or the exposed metal surfaces of the negative electrode current collector in which the negative electrode active material is arranged on one side face each other. The battery comprising the stacked electrode group according to claim 1, further comprising a stacked portion.
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